A fairy (fay, fae, fey, fair folk, or faerie) is a type of mythical being or legendary creature found in the folklore of multiple European cultures ie: Celtic, Slavic, German, English, and French folklore to name a few. A form of spirit often described as metaphysical or supernatural.
Myths and stories about fairies do not have a single origin, but are rather a collection of folk beliefs from disparate sources. Various folk theories about the origins of fairies include casting them as either demoted angels or demons in a Christian tradition, as deities in Pagan belief systems, as spirits of the dead, as prehistoric precursors to humans or as spirits of nature.